Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Hydrocarbon‐soluble oligomers were prepared by the acid‐catalyzed condensation of alkylanilines with formaldehyde. Highest molecular weight oligomers (MW ∼ 6000) were obtained from alkylanilines prepared by the Friedel‐Crafts alkylation of aniline with α‐olefins. By NMR, it was shown that the oligomers contai…
Abstract 1,2,4,5‐Benzenetetra acyl chloride (BTAC) was prepared from pyromellitic anhydride and phosphoric chloride. The behavior in interfacial polycondensation of 4,4′‐methylene dianiline (MDA) or ethylene diamine (EDA) in water with BTAC in dichloromethane with tetrabutyl ammonium chloride (TBAC) as the catalyst wa…
Abstract The fluorinated surface layer of poly(4‐methyl‐1‐pentene) membranes exposed to a dilute stream of fluorine gas has been characterized with X‐ray photoelectron spectroscopy. The concentration and profile of reacted fluorine as a function of exposure time is determined. A computer routine was employed to deconv…
The structure and dynamics of three-dimensional foams are probed quantitatively by exploiting the strong multiple scattering of light that gives foams their familiar white color. Approximating the propagation of light as a diffusion process, transmission measurements provide a direct probe of the average bubble size.…
Abstract The sodium and europium cryptates of the new macrobicyclic ligands 2 and 3 incorporating the 2,2′‐bipyri dine 1,1′‐dioxide and 3,3′‐biisoquinoline 2,2′‐dioxide units, respectively, have been prepared. The Eu III complexes present characteristic 1 H‐NMR spectra, showing large shifts, and are strongly luminesce…
This review contains the results of theoretical and experimental investigations of nonlinear electromagnetic phenomena associated with the effect of the magnetic field of a radio wave on the dynamics of electron movement, and hence on the conductivity of metals. Such a magnetodynamic mechanism of nonlinearity is most…
The objective of this activity is to measure the lithium vaporization from lithium oxide breeder material under differing temperature and moisture partial pressure conditions. Lithium ceramics are being investigated for use as tritium breeding materials. The lithium is readily converted to tritium after reacting with…
The synthesis of a linear polymer having a tertiary amino group in a part of the main chain has been attempted by several methods. However, it was difficult for the linear polyamine to form because of the complicated reaction of the amino group. In the polymerization of weakly basic cyclic amines, e.g., 1-cyanoethylaz…
Abstract Solid‐state extrusion of crystalline polymers is a well‐known technique to produce monoaxial orientation in filaments and films. This is essentially achieved by extruding or drawing the polymer through a convergent die at temperatures below its melting point. Biaxial orientation in die drawing processes has b…
The series of liquid crystals in which the rigid part is constituted by heteroaromatic cation (thiopyrylium, 1- 2 -dithiolium) have been synthesized. The nature of the mesophases depends on the number of flexible substituants grafted on the cationic units. Lamellar (SA) mesophases are obtained with two or three chains…
The texturalcentric model of non-attribute-based visual and tactile response to textural fabric surfaces was used to elicit definitive qualities or dimensions of textural fabric surfaces. Multidimensional scaling analysis permitted subjects to provide numeric judgements of fabrics rather than using words with individu…
Abstract Based upon the synthesis of 3,4,5-tris(alkylthio)-1,2-dithiolium cation salts, we have realized new Langmuir–Blodgett films. They present either a centrosymmetrical or noncentrosymmetrical bilayer organization depending on the involved molecular association with iodine, tetracyanoquinodimethane or some other…
Fuel, in the form of hydrogen isotopes Q2 (where Q is H, D, or T), is required to be stored and assayed in a safe manner at the proposed International Thermonuclear Experimental Reactor (ITER). Two subsystems are proposed for this task: Fuel Storage (FS) and Fuel Management (FM). The combined system, Fuel Storage and…
Abstract The X‐ray photoelectron spectroscopy (XPS) technique has been used to characterize metallophthalocyanine sheet polymers having peripheral carboxyl groups. A comparative analysis of the XPS and electrical conductivity data of metal‐free, and nickel‐ and copper‐containing, phthalocyanine sheet polymers has been…
The conditions under which low viscosity melts drain between refractory particles in a mixture of Na{sub 2}CO{sub 3}, Li{sub 2}CO{sub 3}, and SiO{sub 2} were examined. Samples containing varying mass fractions of premelted alkali carbonate mix (Na{sub 2}CO{sub 3} and Li{sub 2}CO{sub 3}) and silica were heat-treated at…
Abstract The partial electronic conductivity of Ag +- ß"-alumina was determined in the temperature range 180-200 °C, using Wagner's asymmetric galvanic polarization cell Ag| Ag + -ß"-alumina | Pt. The electron conductivity is 4.5 x 10 - 8 Ω -1 cm -1 , while the hole conductivity is about seven orders of magnitude lowe…
The barrier properties of ZrO2 to inward migration of deuterium have been investigated with a view to understanding the hydriding mechanisms of a Zr-2.5% Nb alloy used in CANDU nuclear reactors fuel channels. Thin film oxide specimens, grown in steam to ∼1 μm thickness, have been heated to 350 °C and exposed to deuter…
We have measured the changes in shear modulus and internal friction in ${\mathrm{TaS}}_{3}$ when the charge-density wave (CDW) becomes depinned, as a function of uniaxial strain (\ensuremath{\epsilon}), and compared the results with the strain dependence of transport properties. For strains above a critical strain ${\…
Since our first two publications1,2 pointing out the possible close interrelationship between high temperature superconductivity and an incipient or relaxor-like ferroelectricity, there have been numerous additional reports which support such an interrelationship. It is the purpose of this paper to collect and review…
Abstract Polyimides were prepared from the reaction of two aromatic dianhydrides with two diamines containing carbonyl and ether connecting groups between the aromatic rings. The diamines were prepared from the reaction of 4‐aminophenol or (3‐aminophenol) with an activated aromatic difluoro compound (4,4′‐difluorobenz…